I have just bought and installed a NEC ND-3500 Double Layer Dual 16x DVD R/RW. It came with no installation instructions or software, so I removed my old DVD-ROM and replaced with the DVD RW. I bought some DVD-R disks. When I go to explorer and if there is a DVD in the drive it recognises that it is a DVD RW, but as soon as I put a blank DVD in the drive,it says it is not accessible and reports it as a CD-ROM inthe decription next to the drive. Am I supposed to buy some software to make it work?